Solar Ammo Box Generator - LiFePO4 update!

by Matt Lesak

What's New?

Swapped out 12V 12Ah lead acid battery for LiFePO4 equivalent along with a solar charge controller to match LiFePO4 charging requirements.

LiFePO4 Battery

Solar Charge Controller

Wiring Diagram


  • Lighter
    • 3.5lbs vs 7.5lbs / 1.6kg vs 3.4kg
  • Depth of discharge to 80% vs 50% (115W vs. 72W) usable capacity in theory
  • Built in Battery Management System (BMS) that protects against over discharge, etc.
    • Shifts the battery management from the charge controller to the battery and simplifies the controller
  • Charge controller is MPPT vs PWM


  • Battery is 4X the cost of lead acid equivalent
  • Solar charge controller that is LiFePO4 not as prevalent as PWM controllers
  • Discharge challenge
    • Please watch video for full details on what happens when battery is fully discharged
    • Tricked charge controller and BMS by "jump starting" the system